Air purifier



FIG. 1 is a perspective view of an air purifier showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view showing the air purifier in a state of use.

The evenly spaced broken lines and unshaded areas adjacent to them on the interior in FIG. 8 depict portions of the air purifier that form no part of the claimed design. 

CLAIM We claim the ornamental design for an air purifier, as shown and described. 